Bug 2494877 - CVE-2026-58013 mingw-glib2: buffer over-read in glib/giochannel.c via "g_io_channel_read_line_backend" [fedora-all]
Summary: CVE-2026-58013 mingw-glib2: buffer over-read in glib/giochannel.c via "g_io_c...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: mingw-glib2
Version: rawhide
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Kalev Lember
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["77ff4afa-6e87-4b0b-8af9-c...
Depends On:
Blocks: CVE-2026-58013
TreeView+ depends on / blocked
 
Reported: 2026-06-30 12:58 UTC by Guilherme de Almeida Suckevicz
Modified: 2026-07-17 00:52 UTC (History)
5 users (show)

Fixed In Version: mingw-glib2-2.88.2-2.fc44
Clone Of:
Environment:
Last Closed: 2026-07-17 00:52:36 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2026-06-30 12:58:35 UTC
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A heap-buffer-overflow READ occurs in g_io_channel_read_line_backend() at giochannel.c:1831 when a custom line terminator of length > 1 is set via g_io_channel_set_line_term(). The memcmp call reads line_term_len bytes from nextchar, but the loop condition nextchar < lastchar only guarantees 1 byte is available. When nextchar is within line_term_len - 1 bytes of lastchar, memcmp reads past the GString buffer into ASan redzone / unallocated memory.

Comment 1 Fedora Update System 2026-07-02 17:13:26 UTC
FEDORA-2026-5a55313adb (mingw-glib2-2.88.2-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-5a55313adb

Comment 2 Fedora Update System 2026-07-03 01:26:27 UTC
FEDORA-2026-5a55313adb has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-5a55313adb`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-5a55313adb

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 3 Fedora Update System 2026-07-09 01:45:51 UTC
FEDORA-2026-7bf2937528 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-7bf2937528`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-7bf2937528

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-07-17 00:52:36 UTC
FEDORA-2026-7bf2937528 (mingw-glib2-2.88.2-2.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.


Note You need to log in before you can comment on or make changes to this bug.